Rotor of an electric machine

Abstract

The invention relates to a rotor of a rotary electric machine, in particular for a flux-switching or wound-rotor machine, a mounting for installing the rotor on a shaft and a plurality of magnetic sectors, preferably in the form of a strip, attached to the mounting.

The invention claimed is: 
     
       1. A rotor of a rotating electric machine comprising:
 a support having a generally discoid shape for mounting the rotor on a shaft, and 
 a plurality of magnetic segments that are fastened onto the support such that the segments are disposed on two axially opposite faces of the support, 
 wherein an outer periphery of the support has notches that are superposed axially with notches of the segments. 
 
     
     
       2. A rotor of an alternator exciter, comprising:
 a support for mounting the rotor on a shaft, and 
 a plurality of magnetic segments that are fastened onto the support such that the segments are disposed on two axially opposite faces of the support, 
 wherein an outer periphery of the support has notches that are superposed axially with notches of the segments. 
 
     
     
       3. The rotor according to  claim 1 , wherein the segments are in a strip. 
     
     
       4. The rotor according to  claim 1 , wherein the segments belong to strips of segments which each occupy less than one complete revolution on the rotor. 
     
     
       5. The rotor according to  claim 1 , wherein the segments belong to one or more strip of segments wound on themselves over one complete revolution or more than one complete revolution. 
     
     
       6. The rotor according to  claim 1 , wherein an angular extent of each strip of segments is between 60 and 360°. 
     
     
       7. The rotor according to  claim 1 , wherein each segment comprises at least two half-teeth. 
     
     
       8. The rotor according to  claim 1 , wherein the segments form strips that are offset angularly from one face of the support to the other. 
     
     
       9. The rotor according to  claim 1 , wherein the segments comprise a number of superposed magnetic plates that are snap-fitted to one another. 
     
     
       10. The rotor according to  claim 1 , further comprising a balancing counterweight that is fastened onto the support. 
     
     
       11. The rotor according to  claim 1 , further comprising an electronic circuit that is fastened onto the support. 
     
     
       12. The rotor according to  claim 11 , wherein the electronic circuit comprises at least one rectifying diode. 
     
     
       13. The rotor according to  claim 1 , wherein the support is formed by stamping a plate. 
     
     
       14. The rotor according to  claim 1 , wherein the support comprises rigidifying ribs that each extend in a radial direction. 
     
     
       15. The rotor according to  claim 1 , wherein at least two adjacent segments are linked together by a bridge of material that is made of the same material as the segments. 
     
     
       16. The rotor according to  claim 15 , further comprising a void that is adjacent to the bridge of material. 
     
     
       17. The rotor according to  claim 16 , wherein the void is in the shape of a drop of water. 
     
     
       18. The rotor according to  claim 1 , wherein a number of poles of the rotor is greater than or equal to 4. 
     
     
       19. The rotor according to  claim 1 , wherein the segments are produced from a plate with a carbon content by weight of less than or equal to 0.07%. 
     
     
       20. The rotor according to  claim 1 , wherein the segments bear windings. 
     
     
       21. A rotating electric machine, comprising a rotor as defined in  claim 1 . 
     
     
       22. The machine according to  claim 21 , further comprising a stator having a magnetic circuit produced with plates cut from a different material from that used to produce the segments. 
     
     
       23. The machine according to  claim 22 , wherein the cut plates have a higher carbon content than of the segments. 
     
     
       24. A method for manufacturing a rotor, the rotor including:
 a support having a generally discoid shape for mounting the rotor on a shaft, and 
 a plurality of magnetic segments that are fastened onto the support such that the segments are disposed on two axially opposite faces of the support, 
 wherein an outer periphery of the support has notches that are superposed axially with notches of the segments,
 the method comprising:
 cutting a strip of segments from a magnetic plate, 
 bending the strip, and 
 fastening the strip onto the support. 
 
 
 
     
     
       25. The rotor according to  claim 1 , wherein the rotor is a wound-rotor or the rotating electric machine is a flux-switching machine. 
     
     
       26. The rotor according to  claim 20 , wherein the notches of the support and the notches of the segments receive the windings therein. 
     
     
       27. The rotor according to  claim 2 , wherein the notches of the support and the notches of the segments receive windings therein.